Murphy MGC921 Series - Manual

MGC-95093B

Revised 03-00

Catalog Section 75

(00-02-0134)

Generator Panel

MGC921 Series

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Available in Manual or Auto Start
– 12 or 24 VDC Battery Voltage
– Single Phase or 3-Phase

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Compact

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Full Featured

Description

The MGC921 provides economical engine and
generator control for applications not requiring
NFPA-99 or NFPA-110 approval. Models are
available for Manual or Automatic start designed
for 3-phase, 4-wire or 1-phase, 3-wire genera-
t o r s . M o d e l s M G C 9 2 1 f e a t u r e m e c h a n i c a l
SWICHGAGE

®

s for engine oil and coolant tem-

perature. Models MGC921E feature EGS elec-
tric SWICHGAGE

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s. The panels are housed in a

13 x 10 x 11 in. (330 x 254 x 279 mm) shock
mounted NEMA 1 drip-proof enclosure. Current
transformers (CT’s) are not included.

Features

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Auto-Start Panel includes the following features.

• ASM150, auto-start controller with:

– Optically-isolated noise resistant inputs.
– Outputs for fault annunciator.
– Crank/rest cycle timer, 4 to 25 sec. adjustable.
– Shutdown time delay, 1 to 25 seconds

(adjustable), locks out low oil pressure
and high temperature on start-up.

– Crank disconnect and overspeed

sensing operates from a magnetic pickup
signal (requires 2 Vrms minimum).

• Auxiliary starter relay. Contact rating: 12 volt,

40 amp/24 volt 16 amp.

• Oil pressure SWICHGAGE

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, 2-1/16 in. (52

mm) dial, 0-100 psi (0-689 kPa) [6.89 bar].

• Temperature SWICHGAGE

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, 2-1/16 in (52

mm) dial, 130-250°F (54-121°C), 12 ft.
(3.7 m) capillary.

• TEST-OFF-AUTO selector switch.

• Two 2-1/16 in. (52 mm) dia. holes, plugged.

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Manual Start Panel includes the

following features.

• Power OFF-ON toggle switch and start

push button.

• 518APH TATTLETALE

®

annunciator.

• Auxiliary starter relay. Contact rating: 12 volt,

40 amp/24 volt 16 amp.

• Oil Pressure SWICHGAGE

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, 2 in (51 mm)

dial, 0-100 psi (0-689 kPa) [6.89 bar].

• Temperature SWICHGAGE

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, 2 in (51 mm)

dial, 130-250°F (54-121°C), 12 ft. (3.7 m)
capillary.

• Two (2) 2-1/16 in. (52 mm) diameter holes,

plugged.

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AC meters

• AC voltmeter, 3-1/2 in. (89 mm) dial, ±2%

full scale (specify range: 300 V or 600 V).

• AC ammeter, 3-1/2 in. (89 mm) dial, ±2%

full scale (specify range: 50 to 4000 A).

• AC frequency meter, 120 V, 3-1/2 in. (89

mm) dial, ±0.6% Hz, 45–65 Hz.

• Frequency meter rheostat.

Options

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AC ammeter-voltmeter phase selector switch*.

Requires 2 additional CTs.

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Hourmeter, 2 in. (51 mm) dial, 5-digit.

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Battery voltmeter, 2 in (51 mm) dial (range

determined by battery voltage).

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Battery ammeter, 2 in (51 mm), 60-0-60.

*Standard (included) with 3-phase models.

Specifications

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Auto-Start Panel

• Power Requirements:

– 12 VDC battery for 12 V models.
– 24 VDC battery for 24 V models.

• Inputs: Ground or positive inputs for high

temperature or low pressure sensors.

• Outputs:

– Auxiliary starter relay. Contact rating:

12 volt, 40 amp/24 volt 16 amp.

– 300 mA transistors for fault annunciation

• Operating Temperature: -4 to 140°F (-20 to

60°C).

• Cycle Crank Timer: Up to 8 attempts.

Recrank on false starts (fixed 30 seconds).

• Crank/Rest Cycle Timing: 4 to 25 seconds

(adjustable).

• Shutdown Time Delay: 1 to 25 seconds

(adjustable). Locks out low oil pressure and
high temperature on start up.

• Crank Disconnect Speed Setting:

From 30 to 8500 Hz.

• Overspeed Trip Point Setting:

From 30 to 8500 Hz.

• Magnetic Pickup Input:

Requires 2 Vrms minimum.

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Manual Start Panel

• Power Requirements:

– 12 VDC battery for 12 V models.
– 24 VDC battery for 24 V models.

• Operating Temperature: -4 to 140°F

(-20 to 60°C).

®

FRANK W.

MFR.